To enable to accept users' operation inputs complying with users' wishes.
In a shot operation of a golf game, a portable digital assistant specifies the first touch point and the last touch point by a user as a first operation point and a third operation point, respectively. And the portable digital assistant specifies the touch point that the moving direction of the Y direction reversed or stopped as a second operation point, by tracing the touch points in reverse order to the order detected each touch point from the last touch point. Thereby, the portable digital assistant can recognize that, in the user's touch operations, the position the user lastly reversed the moving direction of the Y direction or stopped his/her finger or the like was operated while being conscious of as the second operation point. As a result, a shot operation complying with the user's wish can be performed.